<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="UTF-8" />
		<meta http-equiv="X-UA-Compatible" content="IE=edge" />
		<meta name="viewport" content="width=device-width, initial-scale=1.0" />
		<title>Document</title>
	</head>
	<body>
		<button class="btn">按钮</button>

		<script>
			var btn = document.querySelector('.btn') // as HTMLButtonElement

			/* btn.onclick = function () {
				console.log('第一个事件被触发')
			}

			btn.onclick = function () {
				console.log('第二个事件被触发')
			} */

			btn.addEventListener('click', function () {
				console.log('第一个事件被触发')
			})

			btn.addEventListener('click', function () {
				console.log('第二个事件被触发')
			})
		</script>
	</body>
</html>
